In Hadoop HDFS, the hdfs dfs -rm -r command is used to delete a directory and its contents recursively. The -r option stands for recursive, which means it will delete all files and subdirectories within the specified directory.

Here’s the basic syntax for using the hdfs dfs -rm -r command to delete a directory in HDFS:

• hdfs dfs: This is the command to interact with HDFS.
• -rm -r: These are the options to indicate that you want to remove a directory and its contents recursively.
• /path/to/directory: Replace this with the actual HDFS path to the directory you want to delete.

For example, if you want to delete a directory named “mydata” located in the root of HDFS, you would use the following command:

Please be cautious when using this command, as it will permanently delete the specified directory and its contents from HDFS, and there is no easy way to recover deleted data in HDFS.